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Acetazolamide Challenge Test: What Patients Should Know

Published: August 9, 2026Updated: August 16, 2026

This test detects the presence of acetazolamide, a diuretic medication, in your urine sample.

Quick summary

{"Acetazolamide is a medication used to treat glaucoma, altitude sickness, and fluid retention","This test checks if the drug is present in your urine","It helps doctors monitor medication compliance or detect possible overdose","No special preparation is needed for this urine test","Results are typically reported as 'Positive' or 'Negative'"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
3301-9
Short code
acetaZOLAMIDE Ur Ql
Synonyms
acetaZOLAMIDE Ur Ql
Category
chemistry
Sample
urine
Container
Sterile urine container (primary)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
≥ 18 years
Method
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
CPT
80307
SNOMED
397550005
Specimen volume
10-50 mL preferred
Stability
Room temperature: 24 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C): 30 days
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
24–72 hours
Order
routine

What is this test?

The Acetazolamide urine test is a laboratory test that detects whether acetazolamide, a prescription diuretic medication, is present in your urine. This is a qualitative test, meaning it shows whether the drug is detected or not, rather than measuring the exact amount.

What is Acetazolamide?

Acetazolamide (also known by the brand name Diamox) is a medication called a carbonic anhydrase inhibitor. It is prescribed to treat several conditions including: glaucoma (to reduce eye pressure), altitude sickness, fluid retention (edema), and certain types of seizures. The medication works by helping the kidneys remove excess water and salts from the body.

Why is this test performed?

Your healthcare provider may order this test for several reasons: to confirm that you are taking acetazolamide as prescribed (medication compliance), to detect if you may have taken too much of the medication (overdose), or to monitor drug levels as part of your treatment plan.

How is the test done?

A urine sample is collected in a sterile container. For most tests, you will be asked to provide a 'clean catch' midstream urine sample. This means you start urinating, then collect the urine sample in the container, and finish urinating in the toilet. The sample is then sent to a laboratory where it is analyzed using specialized equipment to detect the presence of acetazolamide or its metabolites.

Reference range

Negative - No acetazolamide detectedN/A

Specimen: urine

Collect mid-stream clean-catch urine specimen in sterile container. Avoid contamination with toilet paper or fecal material. Inform laboratory of any medications or supplements being taken.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

The detection of acetazolamide in urine has several important clinical applications. Healthcare providers use this information to ensure patients are taking their prescribed medication correctly, which is crucial for treating chronic conditions like glaucoma. The test can also help identify accidental or intentional overdose, as excessive amounts of acetazolamide can cause serious side effects including drowsiness, confusion, and metabolic imbalances. Additionally, in some cases, this test may be used in forensic settings or for drug monitoring programs.

Frequently asked questions

Do I need to fast before this test?
No, you do not need to fast before this test. You can eat and drink normally before providing your urine sample. However, it is important to inform your healthcare provider about all medications you are currently taking, including over-the-counter drugs and supplements.
What do the results mean?
A 'Positive' result means acetazolamide was detected in your urine, indicating you have taken the medication. A 'Negative' result means acetazolamide was not detected in your urine. However, a negative result does not necessarily mean you have not taken the medication—the drug may have already been cleared from your system, or the amount may be below the test's detection threshold. Your healthcare provider will interpret your results in the context of your medical history and treatment plan.
Are there any risks to this test?
There are no significant risks associated with providing a urine sample. The test is non-invasive and simply requires you to urinate into a container.
How long will it take to get results?
The time for results varies by laboratory, but results are typically available within a few days. Your healthcare provider's office will contact you with the results or discuss them at your next appointment.
Can this test detect how much acetazolamide I took?
No, this is a qualitative test that detects the presence or absence of acetazolamide. It does not measure the quantity of the drug in your system. If your healthcare provider needs to know the exact level of acetazolamide, they may order a different type of test called quantitative analysis.
  1. 1
    MedlinePlus - AcetazolamideSource
  2. 2
    Mayo Clinic - Acetazolamide (Oral Route)Source
  3. 3
    National Library of Medicine - AcetazolamideSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy